Heavy duty scraper



Aug 1939. MM. BRODERSEN ET AL 2,168,319

HEAVY DUTY SCRAPER Filed April 6, 1936 2 Sheets-Sheet 2 I fly/V7025Patented Aug. 8, 1939 UNITED STATES arcane nesvy DUTY semen.

Max M. Brodersen, Alhambrm'and Len 0. Bird, Glendale, Calif.; said,Brodersen assignmto said Bird Application April 8, 1936, Serial No.72.934

10 Claims.

This invention relates generally to scrapers and particularly to thetype known as heavy duty, carryall scrapers, by means of which largeamounts of material may be removed, and it is a an improvement in thetype of heavy duty scrapers described in our application for Letters.Patent, filed March 25, 1935, Serial No. 12,812.

01 the manifold objects of this invention, the

principal one is to provide a heavy duty scraper 10 of the jointed frametype having a bowl, a closure for same, and control apparatus for saidbowl,-

closure and jointed frame, in which the elements comprising the controlapparatus are arranged to permit a high degree of leverage thereby lfacilitating the handling of maximum loads with minimum power.

Another ob ect is to confine the elements comprising the controlapparatus within the mini.- mum area consistent with a high degree, ofefflgo ciency, thereby permitting a compact construction which insures alow center of gravity, consequently lessening the possibility of,capsizing the implement when going over an irregular ground surface.

95 A further object is to provide the implement with releasable meansfor holding it in the raised position, as in transportation, so that thepower for actuating the controlling apparatus may be disconnected.

80 Another object is to provide a latch directly associated with thecontrol means for the bowl and closure. said latch being actuated bysaid control means to automatically release after the closure reaches afully opened position, to permit 35 dumping the bowl, and toautomatically lock the bowl in the scraping and carrying position.

Another object is to provide an implement having a jointed framesupported at both ends on wheeled carriages, in which the rear framesec- 40 tion is pivotally connected to the rear carriage, the forwardframe section swivelably supported on the forward carriage and bothframe sections swivelably hinged together between said carriages. Thisconstruction renders the frame flexible which tends to maintain the bowlon an even keel when going over an uneven or irregular surface thuslessening the possibility of capsizing the implement.

As a further object, it provides a simple, compact and economicallyconstructed yet substantial power controlled implement by means of whichlarge quantities of material may be removed, transported over unevensurface without turning over, and discharged quickly and elli- IBciently with a minimum of power. v

(Cl. 87-128) a With these and other objects in view the inventionconsists in the combination, correlation and construction of parts,members and features, which will be described in the specification andwill be finally pointed out in the claims.

Referring to the drawings:

Figure 1 is a plan View of an implement embodying our invention.

Figure 2 is a side elevation of Figure 1, illustrating the implement inthe carrying position.

Figure 3 is'a side elevation showing the implement in .the scrapingposition.

Figure 4 is a side elevation showing the dumping position.

Figure 5 is a section on line 55 in Figure 1, in which the cables fordumping the bowl are eliminated.

Figure 6 is a section on line 6-6 1 Figure 1, showing in detail thelatch for locking the bowl in the carrying position.

Figure 7 is a detail view showing thelatch for holding the implement inthe raised position;

The objects outlined above are attained by the forms of embodiment ofthe invention shown in the drawings, which in a generic sense consistsof a forward and rearward frame sections, swivelably jointed togetherand flexibly supported at the ends on wheeled carriages, a bowlconsisting of a forward section fixed to the frame and a rearwardsection hinged to the forward section, a closure for said bowl, cablemeans controlling the closure and the bowl, cable means for imparting aknee action to the frame structure to raise and lower the bowl, latchmeans for said bowl associated with the closure and bowl controllingcable means, latch means associated with the frame sections to maintainthe implement in the raised position after power has been disconnectedfrom the raising and lowering cable means.

g In the drawings several forms of frame structure are shown in whichthe above outlined features are incorporated either singly or incombination. It is desired to point out that all of the features may beused either singly or in any combination thereof on any of theillustrated frame structures.

Referring to Figures 1 to 'l inclusive:

In a more specific sense, the form of heavy duty scraper exemplified inthese figures in a practical form of embodiment, is shown as comprisinga jointed frame structure i which includes forward and rearward sections2 and 3, respectively. The forward section 2 of the frame I consists ofa transverse member [which is provided with a centrally located leg 3which. in

turn is swivelably supported, as at 3., one wheeled carriage 1. Thewheeled carriage 1 is equipped with a draft tongue 3, whichis'adaptedinthe usual manner for connection to a tractor.. At

wardly' extending arms i3 which are pivotally' supported at their rearends on axle Ii of the wheeled carriage i2. Just 'ahead of the wheeledcarriage i2 and interposedfbetween the arms i0 vis "a transverse tiemember 13. The forward ends of the arms 13 are provided with verticalmembers 14 which'arereinforced by means of diagonal braces i3. Theforward and rearward frame sections 2 and 3, respectively, are pivotallyconnected as at i3.

' The transverse member 4, of the frame section 2, carries centrallylocated thereon, a vertical member i1 which is reinforced by means ofthe diagonal braces i3. A block of four pulleys is secured to the upperend .of the member i 1, as illustrated at i3.

A cross member 23, having at its ends arms 2| which decline rearwardlyand are pivotally connected to the frame section 3, as indicated at 22,is'provided with-a pair of forwardly extending arms 23 which are spacedapart .to straddle the vertical member l1. The arms 23 are reinforced bydiagonal braces 24. The forward ends of arms 23 are supported on links23 which are pivotally connected to the arms 23, as shown 'at 26, and

' to the braces l3, as shown at 21. A block of two pulleys is interposedbetween the forward ends of arms 23, as indicated at 23. Mounted on theleg 3 of the frame section 2, as indicated at 23', is a pair of idlerpulleys 23. Also mounted on the leg 3 are two swiveled pulleys 33 and3i.

A cable 32 dead ended at the upper end of member i1, as shown at 33, isreaved through and between the pulley blocks i3 and 23 then pass overone idler pulley 23 and through the swiveled pulley 3| and is connectedto a drum of any conventional hoist on the tractor.

When a pulling force is applied to cable 32 the arms 23 are pushedrearwardly, by reason of the fixed pulley block i3, thereby swinging therear section 3 upwardly about the axle ll, thus raising bowl 34 which ispivotally mounted on frame section 3, as shown at 33. When the cable 32is released the weight of the bowl and frame a structure lowers same.

To maintain the implement in the raised position while the pulling forceon cable 32 is released, as is desirable in transportation, a latchingdevice 33 is provided which consists of two ,pawls 31 pivotally mounted,one on each arm 23,

as shown at 33. Each pawl 31 is provided with a hook 33 which engages ahook 43 secured to the member I], thus preventing forward-movement ofarms 23 and consequently maintaining the implement in the raisedposition. The pawls 31 are connected together by means of a U shapedmember 4| to which is secured a cable 42 for releasing pawls 31 uponpulling same. Tension springs 43 are connected at one end to the pawls31 as'shown at 43' and at the other end to arms 23, as shown at 44, formaintaining the pawls in position on either side of the dead center. Atall 43 is provided on each pawl 31 to limit the upwardly swingingmovement of said pawls by striking against arms 23. To automaticallybring the pawls into engagement with hooks 43 each pawl is provided witha spur 43 -whichstrikes a cam 41 on each hook '43-near the .end'of therearward movement of arms 23' thereby swinging the pawls down to engagethe hooks 43. j 1 The bowl 34 is provided with closure 43 to retainmaterial in excess of the capacity of the bowl. The-closure 43 has apair of upwardly pivotally connected to frame section 3, as shown at 33.

An automatic latching device 3i, provided to lock the bowl in theloading and carrying position, comprises a pawl 32 pivotally mounted onthe back of bowl 34, as shown at 33, and having a hook 34 adapted toengage a stop 33 on the transverse tie member i3 of frame section 3. Acompression spring 33 is interposed between pawl 32 and the back of bowl34 to force said pawl against the stop 33.

The pawl 32 is provided with a tall 31 to which the dead end of cable 33is connected. The cable 33 is reaved between a pulley block 33 on theback of the bowl, and a pulley block 33, on the cross member 20, passedto a pulley block 3|, on the closure 43, reaved between the pulley blockit.

and pulley block IS, on the member i1, passed over the idler pulley 23and through swiveled pulley 33 then connected to another drum on theconventional hoist mentioned above.

When a pulling force is applied to the cable 33 a block and tackleeffect takes place between pulley blocks l3 and 3 I, thereby firstopening the closure 43, which is lighter in weight than the bowl 34.When closure 43 reaches its limit of upwardly swinging movement, byvirtue of the members 43 striking the cross member 23, as shown inFigure 3, further pulling force on cable 33 causes a block and tackleeifect between pulley blocks 33 and 33, thereby first-releasing latch 32then swinging the bowl about the pivot 33 for discharging. When cable 33is released the bowl 34 is returned first to its loading position bygravity due to its greater weight than that of the closure and isautomatically locked in place by virtue of the pawl 32 latching over thestop 33, further releasing of the cable drops the closure 43.

The latching device 3i releases automatically after the closure 43 hasbeen fully opened due to the fact that the pulling force exerted on thecable 33 must be greater to compress the spring 33 than is necessary toopen the closure.

Having thus described our invention we claim:

1. In a scraper including hinged front and rear frame sections, wheeledcarriages for supporting the front and rear frame sections, a bowlpivotally carried on the rear frame section, a 'closure for said bowlpivotally connected to said :and rearwardly extending members 43 whichare rear frame section, latch means for holding said section forimparting a knee action to the hinged frame sections; latching meansbetween said yoke and front frame section for holding the bowl lntheraised position.

3 2. In a scraper including front and rear frame sections pivotallyconnected together, a bowl pivotally mounted on the rear frame section,a closure for saidbowl pivotally connected to said rear frame section, alatch on said bowl for holding the bowl in the scraping and carryingposition, a cable associated with said closure, bowl and latch forautomatically actuating same in the proper sequence.

3. In a scraper including a frame, wheeled supports for said frame,means for raising and lowering said frame, a bowl pivotally carried insaid frame, a closure for said bowl, a latch to hold said bowl in theloading and carrying position, a cable associated with said closure bowland latch to open the closure, release the latch and tilt the bowl uponpulling said cable.

4. In a road scraping vehicle; a pair of frames arranged one in advanceof the other; means so connecting one frame to the other that the rearframe can be raised and lowered; a bowl mounted on the rear frame tooccupy loading and dumping positions thereon and to be raised andlowered therewith to occupy various load carrying positions; means forlatching the bowl in loading position; means for moving the bowl todumping position; and means for raising the rear frame, comprising atleast one toggle joint connecting the two frames, and cable means on thefront frame for actuating the toggle joint.

5. In a road scraping vehicle; a pair of frames arranged one in advanceof the other; a hinge connection between the confronting ends of saidframes to allow the forward end of the rear frame to be elevated; a bowlcarried by the rear frame; a toggle joint having a long link connectedto the rear frame above said hinge connection, and a short linkconnected to the long link and to the front frame; and a mechanismconnected to said links at their points of connection with each otherand to the front frame at a point between the connections of the linkswith the frame, so that when operated it tends to straighten the linksin a manner to exert a rearward pressure on the rear frame and lift theforward end thereof.

6. In a road scraping vehicle; front and rear frames; a connectionbetween the frames to allow the rear frame to be lifted; a bowl pivotedat its mouth or forward end on the rear frame to occupy loading ordumping positions by lowering or elevating its rear or closed end; meansfor latching the bowl in loading position; a toggle connecting theframes and operable to elevate the rear frame to lift the bowl; andmeans for actuating the bowl'and latching means to first release thebowl and then move it to dumping position.

7. In a road scraping vehicle; front and rear 55 frames; a connectionbetween the frames to allow the rear frame to be lifted; a bowl pivotedat its mouth or forward end on the rear frame to occupy loading ordumping positions by lowering or elevating its rear orclosed end; meansfor latching the bowl in loading position; an apron pivoted on the rearframe to occupy various positions in advance of the mouth of the bowland an elevated position to allow dumping of earth from the bowl; atoggle connection between the frames; means for actuating the toggleconnection to elevate the rear frame and thus lift the bowl and apron;means for actuating the bowl and latching means to first release thebowl and then move it to dumping position; and means for moving theapron to elevated position with movement of the bowl to dumpingposition.

8. In a road scraping vehicle; a pair of frames arranged one in advanceof the other; -a hinge connection between the confrontin'gends of saidframes to allow the forward end of the rear frame to be elevated; a bowlcarried by the rear frame; a toggle joint having a long link connectedto the rear-frame above said hinge connection.

and a short link connected to the long link and to the front frame; anda cable and sheave mechanism connected to said links at their points ofconnection with each other and to the front frame at a point between theconnections of the links with the frames, so that when operated it tendsto straighten the links in a manner to exert a rearward pressure on therear frame and lift the forward end thereof.

9. In a road scraping vehicle; a pair of frames arranged one in advanceof the other; a hinge connection between the confronting ends of saidframes to allow the forward end of the rear frame to be elevated; a bowlcarried by the rear frame; a toggle joint connecting the two frames- 10.In a road scraping vehicle; front and rear actuating the bowl andlatching means to first;

release the bowl and then move it to dumping position.

MAX M. BRODERSEN. LEN O. BIRD.

